Between 2001 and 2011, the number dwellings in Toronto increased 11%, while areas 30km from the downtown core grew about 35%. You can clearly see the effects of the 10m restriction on urban sprawl at p. 11 of the city's census backgrounder:
http://www1.toronto.ca/city_of_toronto/social_development_fi...
Detached homes and town-homes use twice as much energy as apartments, and people commuting 30km to the city generally drive. There has been an uptick in apartment construction recently, but these units are generally too small for families because developers find it more profitable to sell mini-suites to young bachelors.